Yamaha CS80

Laurie
The stability update involved the addition of a diode , that's for tuning stability...I don't think that removing the diodes would be of any help, I suggest you to keep the update and maybe get the new vcos when  the occasional chip will fail  ;)
M
  ----- Original Message ----- 
  From: laurie 
  To: yamahacs80@yahoogroups.com 
  Sent: Thursday, June 22, 2006 3:31 PM
  Subject: Re: [yamahacs80] CS80 Repairs


  I remember doing a mod back in the late 80s/early 90s involving
  replacing the oscillator chips in order to stablize tuning......is the
  IG00153 VCO an earlier version to the ones I put in... or was there a
  later modification after this time-period .....I remember waiting two
  months for the chips from
  japan and paid about $350total . for the 16 of them ....To use these
  chips, there was a mod needed to the M board as well with a diode being
  added or removed (its been a long time)....If these chips are available
  I would also be interested and would need to have instructions on how
  to back engineer the mod with the diode......

  kent_spong wrote:

  > Hi all,
  >
  > As from tommorrow KSR will be providing a new service to all CS80
  > owners. In the form of a board repair by post instead of humping
  > their CS80 to KSR for small repairs and upgrades. In addition to
  > this I have decided to release the Dynamic Mono/Poly mod as a easy
  > to fit kit with everything needed to fit and play. All you have to
  > do is solder in the wires.
  >
  > I have been thinking about taking the midi aspect of the 80 to a
  > new level and producing a kit form of this too. The one thing that
  > seems to be needed is more control of the front panel sliders and
  > switches and an ability to store programs. Since I restore all
  > vintage synths as well as 80's, time seems to be the hardest thing
  > to get to work this all out, but I have made a start with the basic
  > outline.
  >
  > Also some time towards the end of the year I will be refurbishing
  > glide strips with new gold plated spring and crushed velvet cover.
  > My 80 is now sporting a red velvet glide strip. :)
  >
  > I'm still having talks with Yamaha japan via Yamaha UK to get them
  > to run off a batch of IG00153 VCO's for me. So far I have got
  > a "well we might be able to do that" from them. So I am starting a
  > petition to get them to go for it as I feel they think there is not
  > enough people out there who want to buy brand new, dead stable, late
  > version CS80 VCO's. Yes who indeed?
  >
  > Till next time
  >
  > Kent
  >
  > 

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